Langley Park Investment Trust Plc (fka LPI.l)

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Supposedly Langley and each OTC company swapped an equal value of their stocks. In at least some deals, or maybe even all, there was built-in protection for Langley where the OTC companies could sell 50% of the received LPI stock immediately and had to put 50% in escrow. Langley on the other hand received restricted stock. After the holding period if the OTC's stock price had declined from the value when the deal was made, they would have to return LPI shares back to Langley to make up for it.